{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Their structures were elucidated by their extensive high resolution - electrospray ionization mass spectrometry ( HR - ESI - MS ) , one - and two - dimensional spectroscopic analysis , including heteronuclear single quantum coherence ( HSQC ) , HMBC and NOESY experiments ."}
{"Chemical": []}